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jumper

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The simplest form of an on/off switch. It is just a tiny, plastic-covered metal block, which is pushed onto two pins to close that circuit. It is used to select a myriad of functions on a printed circuit board or on a peripheral device. For example, on a PC, jumpers are used to select I/O addresses and IRQs. On an IDE drive, a jumper selects between master and slave. A jumper can be used in place of a more costly DIP switch. See jumperless.

Jumper
Jumpers are used to select options on countless printed circuit boards. The more sophisticated the board, the fewer the jumpers. Having no jumpers is best if changes have to be made by the user, otherwise the board has to be pulled out of the case.

(hardware)jumper - A removable wire or small plug whose presence or absence is used to determine some aspect of hardware configuration.
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Furthermore, I could see from the shortness of his legs that the brute himself was no jumper and probably no runner.
A Princess of Mars by Burroughs, Edgar Rice View in context
I said that over the water we were not quite so generous; that with us, when a singer had lost his voice and a jumper had lost his legs, these parties ceased to draw.
A Tramp Abroad by Twain, Mark View in context
The locomotive whistled vigorously; the engineer, reversing the steam, backed the train for nearly a mile--retiring, like a jumper, in order to take a longer leap.
Around The World In Eighty Days by Verne, Jules View in context
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